The invention relates to a rice dry-planting seedling disc as well as a seedling raising method and application thereof, belonging to the technical field of agricultural machinery equipment. The rice dry-planting seedling disc comprises a disc body, bowl bodies and support bodies, wherein the bowl bodies are inverse cone bodies and are located in the disc body; at least three grooves are formed in the disc body, and the support bodies are located in the grooves; the support bodies are used for supporting the seedling disc so as to conveniently place seedlings on a rice dry-planting machine in piles. By raising the seedlings by virtue of the seedling disc, soil at the roots of the raised seedlings is moderate in dryness and humidity, is dry and comfortable, is agglomerated and is not easily scattered during mechanical dry planting, so that the operations of seedling separation, seedling transportation and mechanical dry planting are easily realized. The seedling disc is applied to the specific rice dry-planting machine and is excellent in energy conservation; compared with a traditional rice transplanter which is high in mechanical energy consumption while walking in an irrigated land, the rice dry-planting machine which is used for planting the seedlings on a dry farmland has the advantages that the more energy is saved, and the speed is relatively high; the operation time can be conveniently controlled, and the seedling transplanting time can be shortened; compared with a seedling throwing manner, a mechanical seedling transplanting manner and a manual seedling transplanting manner, the seedling transplanting time can be shortened.